Brake-shoe.



No. 734,566. PATBNTED/JULY 28, 1903. v

* N N u "'"Issts No. 734,566. PATBNTED JULY 28, 1903.

- J.Y.J. KINZER. BRAKE SHOE.

APPLICATION FILED FEB. 27, 1903. N0 MODEL. 2 SHEETS-SHEET 2,

FIG. 9.

FIG.5.

' WITNESSES I UNITED STATES Patented July 28, 1903.

PATENT OFFICE.

JOHN J. K-INZER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO PITTS- BURGHBRAKE SHOE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

BRAKE-SHOE.

SPEOIFIGATIONforhoing part of Letters Patent No. 734,566, dated 'J' uly28, 1903. Application filed February 27, 1903. Serial No. 145,322. (Nomodel.)

To all whom it may concern.-

Be it known that I,JOHN J. KINZER,Of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a certain new anduseful Improvementin Brake-Shoes, of which improvement the following isa specification.

The object of my invention is to provide a brake-shoe of simple, strong,and inexpensive construction, which may be maintained in operativecondition without. liability to breakage until substantially entirelyworn out, and which may be securely attached to a brake head or hangereither with or without an independent strengthening-back.

The improvement claimed is hereinafter fully set forth.

In aseparate application filed by me of even date herewith, Serial No.145,324, I have set forth generically a brake-shoe consisting of anintegral inclosing casing of strong and ductile material and a fillingof frictional material secured therein.

My present invention is a-specific embodiment of the above generic one,and relates more particularly to the construction of the casing in suchform and manner as will be specially adaptable to the conditions ofpractical service.

In the accompanying drawings, Figure l is a front or face view of abrake-shoe illustrating an application of my invention, with the fillingremoved in order to show the construction more clearly; Fig. 2, alongitudinal central section through the same; Figs. 3 and 4, similarsections illustrating modifications of structural detail; Fig. 5, a rearView of the brake-shoe of Fig. 3; Fig 6, a transversesection on the linea a of Fig. 2, with the filling removed; Figs. 7 and 8', similarsections on the lines 6 b and o 0, respectively, of Fig. 3 3 Fig. 9, arear view of the brake-shoe of Fig. 4, and Fig. 10 a transverse sectionon the line d d of Fig. 4. r

In the practice of my invention I provide a brake-shoe comprisingan'in'closing casing 1 and a filling 3 inserted therein. The casing l ismade of sheet or plate metal possessing a substantial degree of strengthand ductility,

as steel, which is pressed or bent in suitable dies into a structurehaving integral back, side, and end walls and open at its front, andcurved in substantial accordance with the periphery of the car-wheel towhich it is to be applied. In order to afford increased strength, theside and end walls or the easing are preferablycorrugated, and it may befurther stifiened and strengthened by braces 1 which are secured to thecasing by tongues 1, passing through slots in the walls of the casingand turned'over thereon. l may be formed in the braces to reduce theirweight and enable them to be engaged 6o Openings by the fillingwhichfits in the spaces be- I tween them and between their outer facesand the walls of the casing. A'hollow supporting-lug 2, through whichthe brake-shoe is connected to a brake head or hanger, is fixed to theback of the casing, said lug being either formed integral with the backwall of the casing, as shown in Figs. 3, 4, 7, and 10, or being separatetherefrom and connected thereto by having its inner ends passed throughslots in the back wall of the casing and turned over thereon, as inFigs. 2 and 6. In order to prevent the filling of the brakeshoe fromentering the space within the lug 2, a liner 2 may be fitted therein.Short bear: ing-faces 1 adapted to abut against bearings on the ends ofa brake head or hanger, are formed on the back wall of the casing, adjoining its ends, said bearing-faces being preferably recessed. Aseparate and-independent back may be interposed between theback wall ofthe casing and the brake-head for the purpose of strengthening the'shoeand protecting the adjacent face of the head. A

central bearing-face l is also formed on the back wall, extending aboveand below the lug 2, to abut against central bearing-faces on thebrake-hanger. Brake shoes having the central bearing-face l. on" theircasings, as shown in Figs. 2, 3, and,5, may be used either with orwithout a separateiback, as preferred, but if the casing is unp'rovidedwith said central bearing-face, as shown in Fig. 4, a separate back mustbe used in connecting the brake-shoe to the head or hanger..

The independent back referred to is not claimed as of my presentinvention and forms the subject of a separate application filed by me ofeven date herewith, Serial No. 145,323.

The rubbing or frictional action of the brake-shoe upon the wheel isexerted by a frictional member 3, consisting of a filling of anysuitable material, as cast-iron (indicated in Figs. & and or acomposition of matter specially prepared for the purpose (indicated inFigs. 3, 7, and 8) of such character as to exert proper and sutficientfriction upon the periphery of a wheel Without the imposition of undueor excessive pressure thereon, compositions of which character arefamiliar to those skilled in the art. The filling 3 is either cast intothe casing 1 when set in a mold or inserted in the casing under pressureand retained in position, after hardening, by the walls of the casing.

A brake-shoe of the construction above described presents thesubstantial advantages of comparatively inexpensive construction,strength, lightness, and capability of use until practically wornentirely away without liability to breakage as it becomes thin. In theuse of shoes of the construction heretofore employed the tendency tocrack and break when worn to the extent of about onehalf and theconsequent liability to derailment or injury to persons by flyingfragments renders it necessary as a measure of precaution to remove andscrape them when so worn. The waste of material and loss of timeinvolved in so doing are avoided by the employmentof brake-shoesembodying myinvention.

I claim as myinvention and desire to secure by Letters Patent 1. In abrake-shoe, the combination of an inclosing casing of sheet metal bentinto integral back, side and end walls, a sheet-metal lug fixed to theback of the casing, and afilling of frictional material.

2. In a brake-shoe, the combination of an inclosing casing of sheetmetal bent into integral back, side and end walls, and havingstrengthenirig-corrugations in its walls, and a filling of frictionalmaterial.

3. In a brake-shoe, the combination of an inclosing casing of sheetmetal bent into integral back, side, and end walls, strengthening-bracesfixed to said casing, and a filling of frictional material.

4. In a brake-shoe, the combination of an inclosing casing of sheetmetal bent into integral back, side, and end walls, corrugatedstrengthening-braces fixed to said casing, and a filling of frictionalmaterial.

5. In a brake-shoe, the combination of an inclosing casing of sheetmetal bent into integral back, side, and end walls, a sheet-metal lugfixed to the back of the casing, a lining fitting said lug andpartitioning its interior from the casing, and a filling of frictionalmaterial.

6. In a brake-shoe, the combination of an inclosing casing of sheetmetal bent into integral back, side, and end walls, with raised centraland end bearing-faces in its back wall, a lug fixed to the back of thecasing, and a filling of frictional material.

7. In a brake-shoe, the combination of an inclosing casing of sheetmetal bent into integral back, side, and end walls, a separatesheet-metal lug fixed to the back wall of the casing by engagement withslots therein, and a filling of frictional material.

JOHN J. KINZER.

Witnesses:

J. SNOWDEN BELL, CLARENCE A. WILLIAMS.

